<template>
  <div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>

    <el-steps
      :active="2"
      process-status="wait"
      align-center
      style="margin-bottom: 40px"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>
    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chapterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}

          <span class="acts">
            <el-button type="text" @click="openVideo(chapter.id)"
              >添加课时</el-button
            >
            <el-button style="" type="text" @click="openEditChapter(chapter.id)"
              >编辑</el-button
            >
            <el-button type="text" @click="removeChapter(chapter.id)"
              >删除</el-button
            >
          </span>
        </p>

        <!-- 小节 -->
        <ul class="chapterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <span class="acts">
                <el-button type="text" @click="openEditVideo(video.id)"
                  >编辑</el-button
                >
                <el-button type="text" @click="removeVideo(video.id)"
                  >删除</el-button
                >
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next"
        >下一步</el-button
      >
    </div>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number
            v-model="chapter.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number
            v-model="video.sort"
            :min="0"
            controls-position="right"
          />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API + '/edu/vod/video/uploadAliYunVideo'"
            :limit="1"
            class="upload-demo"
          >
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">
                最大支持1G，<br />
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br />
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br />
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br />
                SWF、TS、VOB、WMV、WEBM 等视频格式上传
              </div>
              <i class="el-icon-question" />
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button
          :disabled="saveVideoBtnDisabled"
          type="primary"
          @click="saveOrUpdateVideo"
          >确 定</el-button
        >
      </div>
    </el-dialog>
  </div>
</template>
<script>
import chapter from "@/api/edu/chapter";
import video from "@/api/edu/video";
export default {
  data() {
    return {
      fileList: [], //上传文件列表
      BASE_API: process.env.BASE_API, // 接口API地址
      dialogVideoFormVisible: false,
      dialogChapterFormVisible: false,
      // 初始化video
      video: {
        // 课时对象
        title: "",
        sort: 0,
        isFree: 0,
        videoSourceId: "",
        videoOriginalName: "", // 视频文件名称
      },
      chapter: {
        title: "",
        sort: 0,
      }, // 封装章节数据
      saveBtnDisabled: false, // 保存按钮是否禁用
      // 初始化集合
      courseId: "", // 所属课程
      chapterVideoList: [],
    };
  },
  // 页面渲染之前执行
  created() {
    // 获取路由的id值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      // 根据Id 查询章节和小节
      this.getChapterVideo();
    }
  },

  // 方法调用
  methods: {
    // ================上传视频===========
    // 上传视频成功调用
    handleVodUploadSuccess(response, file, fileList) {
      // 对videoSourceId赋值
      this.video.videoSourceId = response.data.videoId;
      // 上传视频名称赋值
      this.video.videoOriginalName = file.name;
    },
    // 上传之前
    handleUploadExceed(files, fileList) {
      this.$message.warning("想要重新上传视频，请先删除已上传的视频");
    },
    //=================删除视频==============
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`);
    },
    handleVodRemove(file, fileList) {
      video.deleteAliYunVideo(this.video.videoSourceId).then((response) => {
        this.$message({
          type: "success",
          message: "成功删除视频",
        });
        // 删除成功后清空视频列表
        this.fileList = [];
        // 将数据库的视频Id 以及视频名称清空
        this.video.videoSourceId = "";
        this.video.videoOriginalName = "";
      });
    },

    //========================小节信息===============
    openVideo(chapterId) {
      // 显示弹框
      this.dialogVideoFormVisible = true;
      // bug修改 这里打开弹框清空数据 不能在设置chapterId之后
      this.video = {
        // 课时对象
        title: "",
        sort: 0,
        isFree: 0,
        videoSourceId: "",
        videoOriginalName: "", // 视频文件名称
      };
      // 清空视频列表
      this.fileList = [];
      // 设置chapterId
      this.video.chapterId = chapterId;
      // 设置courseId
      this.video.courseId = this.courseId;
    },
    // 保存和修改小节公用方法
    saveOrUpdateVideo() {
      //this.saveVideo();
      this.video.id ? this.updateVideo() : this.saveVideo();
    },
    // 保存小节
    saveVideo() {
      video.addVideoInfo(this.video).then((response) => {
        // 关闭弹框
        this.dialogVideoFormVisible = false;
        // 提示信息
        this.$message({
          type: "success",
          message: "成功保存小节信息!",
        });
        // 刷新数据 调用查询章节小节的方法
        this.getChapterVideo();
      });
    },
    // 修改小节
    updateVideo() {
      video.updateVideo(this.video).then((response) => {
        // 关闭弹框
        this.dialogVideoFormVisible = false;
        // 提示信息
        this.$message({
          type: "success",
          message: "成功修改小节信息!",
        });
        //  解决编辑章节后 再去添加章节会覆盖原有数据的bug 清空数据
        this.video = {};
        // 刷新数据 调用查询章节小节的方法
        this.getChapterVideo();
      });
    },
    // 根据Id删除小节
    removeVideo(videoId) {
      this.$confirm("此操作将永久删除讲师记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        // 调用删除的方法
        video.deleteVideo(videoId).then((response) => {
          // 提示信息
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          // 根据Id 查询章节和小节 刷新数据
          this.getChapterVideo();
        });
      });
    },
    // 根据Id回显小节数据
    openEditVideo(videoId) {
      // 显示小节弹框
      this.dialogVideoFormVisible = true;
      video.getVideoById(videoId).then((response) => {
        this.video = response.data;
        // 回调视频
        this.fileList = [{ name: this.video.videoOriginalName }];
      });
    },
    //========================章节信息===============
    // 根据Id删除章节
    removeChapter(chapterId) {
      this.$confirm("此操作将永久删除讲师记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        // 调用删除的方法
        chapter.deleteChapter(chapterId).then((response) => {
          // 提示信息
          this.$message({
            type: "success",
            message: "删除成功!",
          });
          // 根据Id 查询章节和小节 刷新数据
          this.getChapterVideo();
        });
      });
    },
    // 根据Id查询数据回显
    openEditChapter(chapterId) {
      this.dialogChapterFormVisible = true;
      chapter.getChapterById(chapterId).then((response) => {
        this.chapter = response.data;
      });
    },
    // 调用打开弹框的方法
    openChapterDialog() {
      this.dialogChapterFormVisible = true;
      (this.chapter.title = ""), (this.chapter.sort = 0);
    },
    // 保存章节 或者修改章节的方法
    saveOrUpdate() {
      //  根据章节id 判断  是保存还是修改
      this.chapter.id ? this.updateChapter() : this.saveChapter();
    },
    saveChapter() {
      // 需要传courseId
      this.chapter.courseId = this.courseId;
      chapter.addChapterInfo(this.chapter).then((response) => {
        // 关闭弹框
        this.dialogChapterFormVisible = false;
        // 提示信息
        this.$message({
          type: "success",
          message: "成功保存章节信息!",
        });
        // 刷新数据 调用查询章节小节的方法
        this.getChapterVideo();
      });
    },
    updateChapter() {
      chapter.updateChapter(this.chapter).then((response) => {
        // 关闭弹框
        this.dialogChapterFormVisible = false;
        // 提示信息
        this.$message({
          type: "success",
          message: "成功修改章节信息!",
        });
        //  解决编辑章节后 再去添加章节会覆盖原有数据的bug 清空数据
        this.chapter = {};
        // 刷新数据 调用查询章节小节的方法
        this.getChapterVideo();
      });
    },
    // 根据id查询章节和小节
    getChapterVideo() {
      chapter.getAllChapterVideo(this.courseId).then((response) => {
        // alert(response.data)
        this.chapterVideoList = response.data;
      });
    },
    previous() {
      // 路由跳转到上一个页面
      this.$router.push({ path: "/course/info/" + this.courseId });
    },
    next() {
      // 路由跳转到下一个页面
      this.$router.push({ path: "/course/publish/" + this.courseId });
    },
  },
};
</script>
<style scoped>
.chapterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chapterList li {
  position: relative;
}
.chapterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chapterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #ddd;
}
</style>